Tuner for a guitar pickup



FIG. 1 is a top, front and right side perspective view of a tuner for a guitar pickup showing my new design;

FIG. 2 is a left side elevational view thereof;

FIG. 3 is a top plan view thereof, rotated 180 degrees from FIG. 1; and

FIG. 4 is a rear elevational view thereof.

The bottom is plane and unornamented. 

The ornamental design for a tuner for a guitar pickup, as shown and described. 